Heat oven to 350 F. Lightly oil a large baking sheet and set aside.
Coarsely grate the potatoes by hand or on the disc of a food processor, transferring to a large bowl of cold water as grated. Soak potatoes 1 to 2 minutes after last batch is added to water, then drain well in a colander.
Spread grated potatoes and onion on a kitchen towel and roll up jelly-roll style. Twist towel tightly to wring out as much liquid as possible.
Transfer potato mixture to a bowl and stir in eggs, olive-oil, salt, pepper, baking powder, and flour.
Heat your waffle iron to high heat and coat with olive-oil when hot. Heap some latke mixture on top and spread it into an even layer. Cook until deep golden brown, about 5 minutes. Transfer to a baking sheet and place in the oven to keep warm.
This recipe uses Frescolio's Ají Verde Agrumato EVOO. You could also try any of the following EVOOs for a different taste: